/Engine/Source/Editor/UnrealEd/Public/Kismet2/CompilerResultsLog.h
This class maps from final objects to their original source object, across cloning, autoexpansion, etc...
class FBacktrackMap
TMap<UEdGraphP...
PinSourceBacktrackMap
Maps from transient pins created during compiling to original 'source pin' object.
TMap<UObjectc...
SourceBacktrackMap
Maps from transient object created during compiling to original 'source code' object.